You must go into the options for Jriver and select the DLNA option, otherwise it will not look for the renderer.
Once you have this selected, re-power the renderer and it will show up on the left side of the Jriver menu, assuming it is a UPnP/DLNA renderer. Click on it and then you will be able to go to your playlists and tracks and play music.
BTW, I experienced better SQ using Linn Kinsky and Minimserver. They are both freeware. Must use both together. Start by entering your path to your music files in Minimserver.
Steve N.
Empirical Audio